More often than not, when we see the trailer of a movie (esp. Upcoming Hollywood Biggies), mind-boggling visuals play on the screen whilst that baritone voice narrates the basic plot/random lines in the background. Kind of clichéd, but this is the way they make a trailer. The Baritone VO is one of the best dramatic devices to grab the attention of an audience ever since the art of storytelling originated. But it also has its pros & cons.
Going with the overtly accepted norm, Hindi Film Makers (rather Indian Film Makers..I must say) have started aping their Hollywood counterparts and we are forced to see Hindi Movie Trailers in a voice that convincingly mimics the same baritone voice that our ears are used to hear on HBO/Apple Trailors for ages.
Anyway have a look at the trailer for the movie COMEDIAN (2002) where Jerry Seinfeld spoofs such Trailers, have fun: